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In the 1950s, the American researcher Sidney Darlington
was experimenting with the then novel transistors.
He described a circuit
which magnified the gain of a single transistor significantly.
As the circuit involved two transistors, it became known as the
Darlington pair. George Sziklai later expanded the work.

Darlington combined two bipolar transistors in the circuit.
The amplified signal from the first transistor is again
amplified by a second transistor.
In this way the circuit can achieve very large gains.
By the simplicity of the circuit and the triumph of the transistor,
Darlington pair form the basis for a variety of applications.

In this first part you get to know in ten experiments
how the Darlington pair, Darlington transistors
and the Sziklai pair work
and their main characteristics.

The second part (Go on...) describes another five experiments.
In them you learn about applications of Darlington transistors.